standards – What is the difference between ‘ethical’ and ‘socially responsible’ design

The first sentence of the Wikipedia article on Social Responsibility:

Social responsibility is an ethical framework

To answer your questions:

is ethical design inclusive of socially responsible design practices

If one’s practice includes concepts of ‘ethical design’ then I’d assume ‘social responsible’ design would be considered part of that ethical mantra. So, yes, in that sense it’d be inclusive of all aspects of ethical design.

are they different considerations when it comes to product/service design in the digital space

I don’t see how something being digital would change any sort of ethical standards regarding the design process.